Ministry of Earth Sciences
Depression over southeast Bay of Bengal
Pre-cyclone watch issued for Andhra Pradesh Coast
Latest satellite imageries and surface observations indicate that a depression has formed over southeast Bay of Bengal and lay centred at 0530 hrs IST of today, the 13th December, 2018 near latitude 6.5°N and longitude 88.7°E, about 850 km east-southeast of Trincomalee , 1170 km southeast of Chennai  and 1350 km south-southeast of Machilipatnam . It is very likely to intensify further into a deep depression during next 12 hours and into a Cyclonic Storm during the subsequent 24 hours. It is very likely to move northwestwards towards Andhra Pradesh & adjoining north Tamil Nadu coast during next 72 hours.
Forecast track and intensity are given in the following table:
|Date/Time
||Position 
||Maximum sustained surface wind speed 
||Category of cyclonic disturbance
|
|13.12.18/0530
||6.5/88.7
||40-50 gusting to 65
||
|
Depression
|13.12.18/1130
||7.0/88.4
||45-55 gusting to 65
||
|
Depression
|13.12.18/1730
||7.5/88.0
||50-60 gusting to 70
||
|
Deep Depression
|13.12.18/2330
||8.0/87.5
||
55-65 gusting to 75
||
|
Deep Depression
|
14.12.18/0530
||
8.5/87.0
||
60-70 gusting to 80
||
|
Cyclonic Storm
|
14.12.18/1730
||
9.5/85.7
||
70-80 gusting to 90
||
|
Cyclonic Storm
|
15.12.18/0530
||
10.8/84.4
||
80-90 gusting to 100
||
|
Cyclonic Storm
|
15.12.18/1730
||
12.2/83.2
||
90-100 gusting to 110
||
|
Severe Cyclonic Storm
|
16.12.18/0530
||
13.6/82.2
||100-110 gusting to 120
||
|
Severe Cyclonic Storm
Warnings:
- Heavy rainfall warning
- Rainfall at most places with heavy to very heavy falls at isolated places likely to commence over coastal Andhra Pradesh and north coastal Tamil Nadu on 15th December.
- Rainfall at most places with heavy to very heavy falls at a few places and extremely heavy falls  at isolated places likely over coastal Andhra Pradesh on 16th December and isolated heavy falls on 17th.
- Wind warning
- 13th December: Squally wind speed reaching 45-55 kmph gusting to 65 kmph is very likely to prevail over central parts of south Bay of Bengal and adjoining Equatorial Indian Ocean.
- 14th December: Gale wind speed reaching 65-75 kmph gusting to 85 kmph is very likely over southwest & adjoining southeast Bay of Bengal.
- 15th December:
- Squally wind speed reaching 45-55 kmph gusting to 65 kmph is likely to commence along & off Coastal Andhra Pradesh and north Tamilnadu & Puducherry coasts from morning.
- Gale wind speed reaching 90-100 kmph gusting to 110 kmph is likely to prevail over southwest & adjoining westcentral Bay of Bengal.
- Gale wind speed reaching 60-70 kmph gusting to 80 kmph is likely to prevail along & off coastal Andhra Pradesh from morning and will increase gradually thereafter. Squally wind speed reaching 45-55 kmph gusting to 65 kmph over north Tamil Nadu & Puducherry coast.
- Gale wind speed reaching 100-110 kmph gusting to 120 kmph is likely to prevail over westcentral & adjoining southwest Bay of Bengal.
- Sea condition
The sea condition is very likely to be rough to very rough over central parts of south Bay of Bengal and adjoining Equatorial Indian Ocean on 13th and high over southwest & adjoining southeast Bay of Bengal on 14th. The sea condition is very likely to be high to very high over southwest & adjoining westcentral Bay of Bengal on 15th and over westcentral & adjoining southwest Bay of Bengal on 16th.
- Fishermen Warning
- The fishermen are advised not to venture into central parts of south Bay of Bengal & adjoining Equatorial Indian Ocean on 13th, into southwest & adjoining southeast Bay of Bengal on 14th, into southwest & adjoining westcentral Bay of Bengal on 15th and westcentral & adjoining southwest Bay of Bengal on 16th December.
· Those, who are out in deep sea areas are advised return to the coast.